In order to use sequences of vector magnetogram data as
input to MHD simulations of the solar atmosphere, one must
ensure that the data is consistent with the MHD induction
equation. We describe a new technique, ILCT, that uses local
correlation tracking to determine a 3-D flow field that is
consistent with the ideal MHD induction equation. The flow
fields are thus suitable for incorporation into the
photospheric boundary of an MHD simulation of the solar
atmosphere.